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Note 3. Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Detail) - Major Components of Property, Plants, Equipment and Mineral Interests (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Cost	$ 1,313,414	$ 1,176,590
Less accumulated depreciation, depletion and amortization	390,202	343,302
Net carrying value	923,212	833,288
Mining Properties, Including Asset Retirement Obligations [Member]
Cost	286,873	276,869
Mine Development [Member]
Cost	123,772	114,071
Plants And Equipment [Member]
Cost	383,045	351,146
Land [Member]
Cost	11,188	10,301
Mineral Interests [Member]
Cost	383,491	358,857
Construction in Progress [Member]
Cost	$ 125,045	$ 65,346

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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- Definition

Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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